Eugen schaal



TUS

HIGKENING' LINSEBD Patented Mar. 7

E. PPARA (No Model.)

PROCESS-0F AND A WITNESSES:

UNITED STATES PATENT OFFICE.

EUGEN SCHAAL, OF STUTTGART, GERMANY.

PROCESS OF AND APPARATUS FOR THICKENING LlNSEED-OIL.

SPECIFICATION forming part of Letters Patent No. 493,187, dated March 7,1893.

Application filed June 30, 1892- Serial No. 438,550. (No model.)

To a/ZZ whom it may concern:

Be it known that I, EUGEN SOHAAL, a citizen of the German Empire,residing at Stuttgart, in the Kingdom of Wiirtemberg, Germany, haveinvented new and useful Improvements in Processes of and Apparatus forThickening Linseed-Oil, of which the following is a specification.

It is a well known fact that when linseed oil is boiled for some timetill it loses about one-sixth of its weight it becomes thicker,tenacious and viscid and it dries up still more readily than in thefreshstate to a tough, turpentine like mass, scarcely soluble in oils. It isalso a Well known fact that linseed oil heated to about 323375centigrade takes fire and burns quickly (see Watts Dictionary ofChemistry, Vol. III, lines 23-18 from bottom of page 702) and if the oilwhile being heated to the abovenamed temperature comes in contactwithatmospheric air, an explosion takes place. Nowl have'discovered thatby maintaining a current of steam or of an in- Y different gas such ascafio nic acid gas or nitrogen over the surface of the oil during thegrogress of heating, the temperature of the oil can be raised to andmaintained at 330 to 345 centigrade and the required consistency can berapidly attained without allowing the oil to ignite and all danger of anexplosion is avoided. Furthermore I am enabled to con tinue the processof thickening the oil without interruption by admitting fresh oil to thebottom of the mass while the thickened oil is permitted to flow off fromthe top. I have also constructed a novel apparatus which can be usedwith advantage in carrying out my new process and the construction ofwhich is pointed out in the following specification and illustrated inthe accompanying drawing, which shows a longitudinal vertical section.

In the drawing the letter A designates a kettle into which the oil isfed through the pipe d and from the top of which extends a goose neck awhich connects with a pipe 0 extending down into the condenser B. Fromthe top of the condenser extends a pipe I) which leads into the open airor into a chimney. From the side of the kettle A extends a pipe e whichleads into the top part of a vessel 0 and above this pipe is an openingfwhich connects by a tube f with a steamboiler or with a reservoircontaining an indifferent gas under pressure.

T is a pipe for the introduction of a thermometer.

Beneath the kettle A is a fire place F for the purpose of heating thecontents of said kettle.

The kettle A-is charged with linseed oil about to a level with the'pipee and the oil is heated rapidly to about 270280 centigrade while acurrent of steam or of an indifferent gas is introduced through the tubef in the direction of the condenser E, the temperature in the kettle Abeing permitted to rise to 330345 centigrade, and this temperature ismaintained until a test shows that the oil has reached the desiredthickness. Then the fire is removed and while the current of steam orgas is maintained, the oil is permitted to cool off to about 290centigrade when it is ready for immediate use.

By the current of steam or indlfferent gas the atmospheric air is drivenout of the kettle A and the oil is prevented from igniting. If byinadvertenoe the temperature in the kettle A should rise above 345centigrade, cold linseed oil is introduced through the pipe at and bycarrying this cold oil down near to the bottom of the kettle A while thethickened oil is permitted to flow off at the top through the pipe einto the vessel 0, the temperature in the kettle A can be regulated andthe process of thickening can be carried on for a longtime withoutinterruption. The oil vapors which are carried into the condenser E bythe current of steam or gas become liquefied and are saved.

What I claim as new, and desire to secure by Letters Patent, is

1. The within described process of thickening linseed oil which consistsin heating the oil to a temperature of 320345 centigrade,

maintaining a current of an indifferent fluid over the surface of theheated oil, introducing fresh oil into the lower portion of the heatedmass and permitting the thickened oil to flow off from the top,substantially as described.

2. The combination with the kettle A and its feed pipe d, extending downto the lower ICO portion of thekettle of a tube f leading into Intestimony whereof I have hereunto set the kett1e,a goose-neck a, acondenser B conmy hand in the presence of two subscribing nected to thegoose-neck, an escape pipe 12 witnesses.

leading from the condenser, an overflow pipe EU GEN SGHAAL. 5 0 leadingfrom the kettle A, and a vessel 0 Witnesses:

connected with the pipe e, substantially as WV. IIAUFF,

described. E. F. KASTENHUBER.

